Can't format drive after Bootcamp

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Can't format drive after Bootcamp

Hello guys. As many others before me I tried to create a Windows partition on my iMac and install a windows os via Bootcamp. Didn't work. Also, after that I have a "Microsoft Reserved" partition that I can't erase and all kind of mess with other partitions. Did a clean install of Yosemite but it didn't help.

I have an install usb stick the Yosemite installer on it and the Mac I have is: iMac (27-inch, Late 2012) 3TB Fusion drive

I ran this command with Terminal: diskutil list

Here's the result:

chriss-iMac:~ chris$ diskutil list

/dev/disk0

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *121.3 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_HFS Untitled 121.0 GB disk0s2

/dev/disk1

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *3.0 TB disk1

1: EFI EFI 209.7 MB disk1s1

2: Apple_CoreStorage 1.9 TB disk1s2

3: Apple_Boot Recovery HD 650.1 MB disk1s3

4: Apple_CoreStorage 314.6 MB disk1s4

5: EFI NO NAME 104.9 MB disk1s5

6: Microsoft Reserved 134.2 MB disk1s6

7: Apple_HFS Untitled 801.4 GB disk1s7

/dev/disk2

#: TYPE NAME SIZE IDENTIFIER

0: Apple_HFS Macintosh HD *1.9 TB disk2

Logical Volume on disk1s2

E6F8D0D9-4777-4619-BF8A-51C7ED6532D3

Unencrypted

/dev/disk3

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *31.3 GB disk3

1: EFI EFI 209.7 MB disk3s1

2: Apple_HFS Install OS X Yosemite 30.9 GB disk3s2

chriss-iMac:~ chris$

and this one: diskutil cs list

chriss-iMac:~ chris$ diskutil cs list

CoreStorage logical volume groups (2 found)

|

+-- Logical Volume Group 17280591-2E9B-43A1-99A1-B7F2557A0436

| =========================================================

| Name: disk1s4

| Status: Online

| Size: 314572800 B (314.6 MB)

| Free Space: 0 B (0 B)

| |

| +-< Physical Volume 37A299F9-B5D9-4E05-A68C-F0396A07B68C

| ----------------------------------------------------

| Index: 0

| Disk: disk1s4

| Status: Online

| Size: 314572800 B (314.6 MB)

|

+-- Logical Volume Group 055B7520-9F92-450A-A47E-523A81EA1FA8

=========================================================

Name: Macintosh HD

Status: Online

Size: 1942812377088 B (1.9 TB)

Free Space: 10760192 B (10.8 MB)

|

+-< Physical Volume 40B7B2A7-0ABC-4C39-A139-D8DB07742E25

| ----------------------------------------------------

| Index: 0

| Disk: disk1s2

| Status: Online

| Size: 1942812377088 B (1.9 TB)

|

+-> Logical Volume Family 32E5E972-F879-4D30-9A51-4E11E66BD441

----------------------------------------------------------

Encryption Status: Unlocked

Encryption Type: None

Conversion Status: NoConversion

Conversion Direction: -none-

Has Encrypted Extents: No

Fully Secure: No

Passphrase Required: No

|

+-> Logical Volume E6F8D0D9-4777-4619-BF8A-51C7ED6532D3

---------------------------------------------------

Disk: disk2

Status: Online

Size (Total): 1942449291264 B (1.9 TB)

Conversion Progress: -none-

Revertible: No

LV Name: Macintosh HD

Volume Name: Macintosh HD

Content Hint: Apple_HFS

I am trying to just completely format the internal drive and create back the fusion drive with 1 Macintosh HD drive visible on desktop.

You are my only hope 🙂

Many thanks,

Chris

iMac (27-inch, Late 2012), OS X Yosemite (10.10.5)

Posted on Nov 18, 2015 3:26 PM

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Answer 1

Loner T

Level 9

59,513 points

Nov 18, 2015 4:44 PM in response to chris panas

1. Please post the output of

sudo gpt -vv -r show /dev/disk1

2. What was done to the Bootcamp partition?

3. A MSR partition shows up when an EFI boot is attempted and the Windows Installer starts, but is unable to format/find a FAT partition to install Windows.

4. What is the version of Windows you are trying to install?

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Answer 2

chris panas Author

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Nov 18, 2015 11:34 PM in response to Loner T

Thank you so much!

The output:

gpt show: /dev/disk1: mediasize=3000592982016; sectorsize=512; blocks=5860533168

gpt show: /dev/disk1: PMBR at sector 0

gpt show: /dev/disk1: Pri GPT at sector 1

gpt show: /dev/disk1: Sec GPT at sector 5860533167

start size index contents

0 1 PMBR

1 1 Pri GPT header

2 32 Pri GPT table

34 6

40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

409640 3794555424 2 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

3794965064 1269760 3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC

3796234824 1464

3796236288 614400 4 GPT part - 53746F72-6167-11AA-AA11-00306543ECAC

3796850688 204800 5 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B

3797055488 262144 6 GPT part - E3C9E316-0B5C-4DB8-817D-F92DF00215AE

3797317632 497647432

4294965064 1565305920 7 GPT part - 48465300-0000-11AA-AA11-00306543ECAC

5860270984 262151

5860533135 32 Sec GPT table

5860533167 1 Sec GPT header

chriss-iMac:~ chris$

I was trying to install Windows 8 but now I just want to get back to the basic Macintosh HD and that's it. Bootcamp partition was erased with disk utility as I didn't have the option to do it with the Bootcamp installer.

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Answer 3

Loner T

Level 9

59,513 points

Nov 19, 2015 10:23 AM in response to chris panas

chris panas wrote:

I was trying to install Windows 8 but now I just want to get back to the basic Macintosh HD and that's it. Bootcamp partition was erased with disk utility as I didn't have the option to do it with the Bootcamp installer.

DU does not understand BCA partitioning.

The simplest and safest solution is to backup OSX, boot into Internet Recovery, erase your internal Fusion drive, and restore from backup. Time Machine will usually makes this painless.

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Answer 4

chris panas Author

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Nov 19, 2015 12:15 PM in response to Loner T

Ok, can't use Time Machine because I don't have any external drive with me atm. Can I do a clean install from a usb though? I made an Yosemite installer.

I don't know how to erase the ssd and the rest via Terminal either - when I tried with the Disk Utility it didn't work. Many thanks for the help sir!

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Answer 5

Loner T

Level 9

59,513 points

Nov 19, 2015 1:02 PM in response to chris panas

1. Do you have a backup of OSX? Any external disk connected directly to the Mac can be used as a backup disk, provided it has enough disk space and is formatted properly.

2. Are you able to boot in Internet Recovery?

3. In Internet Recovery, Utilities -> Disk Utility will let you erase the entire disk.

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Answer 6

chris panas Author

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Nov 19, 2015 1:06 PM in response to Loner T

I don't have a backup of the OSX but can make one - does it mea I need to install it on an external drive or just make a backup of my current system using Time Machine?

I'm able to boot in Internet Recovery.

What should I do then?

Many thanks!

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Answer 7

chris panas Author

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Nov 19, 2015 1:28 PM in response to chris panas

*Update: Can't erase "disk1s6" and "Untitled" and there is around 1TB missing somewhere. I'm in Internet Recovery and using Utility Disk. Attached is a photo of how it looks like.

I messed up good :-//

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Answer 8

Loner T

Level 9

59,513 points

Nov 19, 2015 1:58 PM in response to chris panas

Unless you have an OSX backup of all your files, I would not recommend erasing any drives.

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Answer 9

chris panas Author

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Nov 19, 2015 2:24 PM in response to Loner T

Yes, I did a backup of everything before even trying to use Bootcamp so no worries. Now I'm just trying to wipe out clean the entire drive and make a clean install of Yosemite. I managed to get a Macintosh HD, DU also shows a disk 1s4 partition (Logical Volume Group) 314.6MB and a free space - I can't erase this Free space partition.

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Answer 10

Loner T

Level 9

59,513 points

Nov 20, 2015 10:33 AM in response to chris panas

Start Utilities -> Terminal.

1. Erase Macintosh HD volume - diskutil cs eraseVolume E6F8D0D9-4777-4619-BF8A-51C7ED6532D3.

2. Erase Macintosh HD volume group - diskutil cs delete 17280591-2E9B-43A1-99A1-B7F2557A0436

3. Erase underlying SSD - diskutil eraseDisk jhfs+ SSD disk0

4. Erase underlying HDD - diskutil eraseDisk jhfs+ HDD disk1

5. Create a new LVG (the SSD must be first) - diskutil cs create OSX-MacintoshLVG disk0s2 disk1s2

6. Step 5 will generate a new UUID (long string).

7. Create a new LV - diskutil cs createVolume LongStringFromStep5 jhfs+ "Macintosh HD" 100%

8. Restore from TM backup.

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Answer 11

chris panas Author

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Nov 20, 2015 1:00 AM in response to Loner T

Can't delete them, this is what I'm getting in Terminal:

-bash-3.2# diskutil cs list

CoreStorage logical volume groups (2 found)

|

+-- Logical Volume Group 17280591-2E9B-43A1-99A1-B7F2557A0436

| =========================================================

| Name: disk1s4

| Status: Online

| Size: 314572800 B (314.6 MB)

| Free Space: 0 B (0 B)

| |

| +-< Physical Volume 37A299F9-B5D9-4E05-A68C-F0396A07B68C

| ----------------------------------------------------

| Index: 0

| Disk: disk1s4

| Status: Online

| Size: 314572800 B (314.6 MB)

|

+-- Logical Volume Group 055B7520-9F92-450A-A47E-523A81EA1FA8

=========================================================

Name: Macintosh HD

Status: Online

Size: 1942812377088 B (1.9 TB)

Free Space: 20971520 B (21.0 MB)

|

+-< Physical Volume 40B7B2A7-0ABC-4C39-A139-D8DB07742E25

| ----------------------------------------------------

| Index: 0

| Disk: disk1s2

| Status: Online

| Size: 1942812377088 B (1.9 TB)

|

+-> Logical Volume Family 32E5E972-F879-4D30-9A51-4E11E66BD441

----------------------------------------------------------

Encryption Status: Unlocked

Encryption Type: None

Conversion Status: NoConversion

Conversion Direction: -none-

Has Encrypted Extents: No

Fully Secure: No

Passphrase Required: No

|

+-> Logical Volume E6F8D0D9-4777-4619-BF8A-51C7ED6532D3

---------------------------------------------------

Disk: disk3

Status: Online

Size (Total): 1942455853056 B (1.9 TB)

Size (Converted): -none-

Revertible: No

LV Name: Macintosh HD

Volume Name: Macintosh HD

Content Hint: Apple_HFS

-bash-3.2# diskutil cs eraseVolume E6F8D0D9-4777-4619-BF8A-51C7ED6532D3

diskutil: did not recognize coreStorage verb "eraseVolume"; type "diskutil coreStorage" for a list

-bash-3.2#

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Answer 12

Loner T

Level 9

59,513 points

Nov 20, 2015 10:33 AM in response to chris panas

Please try

diskutil cs deleteVolume E6F8D0D9-4777-4619-BF8A-51C7ED6532D3.

(So much for deleteVolume and eraseVolume naming consistency).

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Answer 13

chris panas Author

Level 1

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Nov 20, 2015 10:34 AM in response to Loner T

Dude, thank you soooo much! Everything is like new now 😀 Thank you thank you thank you 😀

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Answer 14

Loner T

Level 9

59,513 points

Nov 20, 2015 10:44 AM in response to chris panas

Can you post the output of diskutil list and diskutil cs list for verification?

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